Holiday gift certificates were turned in for Eminem, Green Day and Lil Jon albums as the annual post-Christmas slump struck last week.

Sales of Eminem’s “Encore” (Shady/Aftermath/Interscope) slid more than 50%, but its tally of 198,000 copies was good enough to keep the disc in the No. 1 slot, according to Nielsen SoundScan figures.

Green Day’s “American Idiot” (Reprise) dropped 40% to 170,000 for the week ended Sunday, but the disc still rose seven slots to No. 2. Lil Jon & the East Side Boyz’s “Crunk Juice” (TVT) sold 144,000, jumping 12 spaces to No. 3.

Sony Music made a risky move by releasing a debut album in the traditionally fallow period and produced top 10 results. Soul singer-pianist John Legend’s “Get Lifted” (Sony Urban Music/Columbia) sold 115,000 copies to bow at No. 7. Legend was heavily promoted during the sales week by AOL, which reported that his two videos and his Sessions@AOL perf had been played nearly 1.2 million times and that “Get Lifted” was the top-selling disc in the AOL store.

Only three albums from the previous week’s top 200 saw sales bumps in the New Year’s week: “The Phantom of the Opera” soundtrack (Really Useful/Sony Classical), which was up to 40,000 copies; “Garden State” soundtrack (Sony), which sold 37,000 thanks to release of the pic on DVD; and Snow Patrol’s “Final Straw” (A&M), which climbed 101 slots to No. 91, selling 20,000. “The Life Aquatic With Steve Zissou” (Hollywood) debuted at No. 141 on sales of 12,000.